Editing FN MAG (section)

===Features===
[[File:FN MAG white background.jpg|thumb|right|Muzzle end of the MAG with rotary gas selector switch]]
The MAG's receiver is constructed from sheet metal stampings reinforced by steel plates and [[rivet]]s. The front is reinforced to accept the barrel nut and gas cylinder which are permanently mounted. Guide rails that support the bolt assembly and piston extension during their reciprocating movement are riveted to the side plates. The bolt's guide rails are shaped downward to drive the locking lever into engagement with the locking shoulder, which is also riveted to the side plates. The rear of the receiver has been reinforced and slotted to accept the butt stock.<ref name="remtek.com"/> The MAG is also equipped with a fixed wooden [[stock (firearm)|stock]] (later production models feature polymer furniture), pistol grip, and carrying handle.

A user-adjustable gas valve allows regulating the [[Rate of fire#Cyclic rate|cyclic rate of fire]] from 650 up to 1,000 rounds per minute, and subsidiary can adjust the gas system for various types of cartridge loadings or use in the presence of heavy fouling. A high cyclic rate of fire is advantageous for use against targets that are exposed to a general-purpose machine gun for a limited time span, like aircraft or targets that minimize their exposure time by quickly moving from cover to cover. For targets that can be fired on by a general-purpose machine gun for longer periods than just a few seconds, the cyclic firing rate becomes less important.